1 //===-- ExecutionEngine.cpp - Common Implementation shared by EEs ---------===//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 // This file defines the common interface used by the various execution engine
13 //===----------------------------------------------------------------------===//
15 #define DEBUG_TYPE "jit"
16 #include "llvm/Constants.h"
17 #include "llvm/DerivedTypes.h"
18 #include "llvm/Module.h"
19 #include "llvm/ModuleProvider.h"
20 #include "llvm/ADT/Statistic.h"
21 #include "llvm/Config/alloca.h"
22 #include "llvm/ExecutionEngine/ExecutionEngine.h"
23 #include "llvm/ExecutionEngine/GenericValue.h"
24 #include "llvm/Support/Debug.h"
25 #include "llvm/Support/MutexGuard.h"
26 #include "llvm/System/DynamicLibrary.h"
27 #include "llvm/System/Host.h"
28 #include "llvm/Target/TargetData.h"
33 STATISTIC(NumInitBytes, "Number of bytes of global vars initialized");
34 STATISTIC(NumGlobals , "Number of global vars initialized");
36 ExecutionEngine::EECtorFn ExecutionEngine::JITCtor = 0;
37 ExecutionEngine::EECtorFn ExecutionEngine::InterpCtor = 0;
38 ExecutionEngine::EERegisterFn ExecutionEngine::ExceptionTableRegister = 0;
41 ExecutionEngine::ExecutionEngine(ModuleProvider *P) : LazyFunctionCreator(0) {
42 LazyCompilationDisabled = false;
44 assert(P && "ModuleProvider is null?");
47 ExecutionEngine::~ExecutionEngine() {
48 clearAllGlobalMappings();
49 for (unsigned i = 0, e = Modules.size(); i != e; ++i)
53 /// removeModuleProvider - Remove a ModuleProvider from the list of modules.
54 /// Release module from ModuleProvider.
55 Module* ExecutionEngine::removeModuleProvider(ModuleProvider *P,
56 std::string *ErrInfo) {
57 for(SmallVector<ModuleProvider *, 1>::iterator I = Modules.begin(),
58 E = Modules.end(); I != E; ++I) {
59 ModuleProvider *MP = *I;
62 return MP->releaseModule(ErrInfo);
68 /// FindFunctionNamed - Search all of the active modules to find the one that
69 /// defines FnName. This is very slow operation and shouldn't be used for
71 Function *ExecutionEngine::FindFunctionNamed(const char *FnName) {
72 for (unsigned i = 0, e = Modules.size(); i != e; ++i) {
73 if (Function *F = Modules[i]->getModule()->getFunction(FnName))
80 /// addGlobalMapping - Tell the execution engine that the specified global is
81 /// at the specified location. This is used internally as functions are JIT'd
82 /// and as global variables are laid out in memory. It can and should also be
83 /// used by clients of the EE that want to have an LLVM global overlay
84 /// existing data in memory.
85 void ExecutionEngine::addGlobalMapping(const GlobalValue *GV, void *Addr) {
86 MutexGuard locked(lock);
88 void *&CurVal = state.getGlobalAddressMap(locked)[GV];
89 assert((CurVal == 0 || Addr == 0) && "GlobalMapping already established!");
92 // If we are using the reverse mapping, add it too
93 if (!state.getGlobalAddressReverseMap(locked).empty()) {
94 const GlobalValue *&V = state.getGlobalAddressReverseMap(locked)[Addr];
95 assert((V == 0 || GV == 0) && "GlobalMapping already established!");
100 /// clearAllGlobalMappings - Clear all global mappings and start over again
101 /// use in dynamic compilation scenarios when you want to move globals
102 void ExecutionEngine::clearAllGlobalMappings() {
103 MutexGuard locked(lock);
105 state.getGlobalAddressMap(locked).clear();
106 state.getGlobalAddressReverseMap(locked).clear();
109 /// updateGlobalMapping - Replace an existing mapping for GV with a new
110 /// address. This updates both maps as required. If "Addr" is null, the
111 /// entry for the global is removed from the mappings.
112 void ExecutionEngine::updateGlobalMapping(const GlobalValue *GV, void *Addr) {
113 MutexGuard locked(lock);
115 // Deleting from the mapping?
117 state.getGlobalAddressMap(locked).erase(GV);
118 if (!state.getGlobalAddressReverseMap(locked).empty())
119 state.getGlobalAddressReverseMap(locked).erase(Addr);
123 void *&CurVal = state.getGlobalAddressMap(locked)[GV];
124 if (CurVal && !state.getGlobalAddressReverseMap(locked).empty())
125 state.getGlobalAddressReverseMap(locked).erase(CurVal);
128 // If we are using the reverse mapping, add it too
129 if (!state.getGlobalAddressReverseMap(locked).empty()) {
130 const GlobalValue *&V = state.getGlobalAddressReverseMap(locked)[Addr];
131 assert((V == 0 || GV == 0) && "GlobalMapping already established!");
136 /// getPointerToGlobalIfAvailable - This returns the address of the specified
137 /// global value if it is has already been codegen'd, otherwise it returns null.
139 void *ExecutionEngine::getPointerToGlobalIfAvailable(const GlobalValue *GV) {
140 MutexGuard locked(lock);
142 std::map<const GlobalValue*, void*>::iterator I =
143 state.getGlobalAddressMap(locked).find(GV);
144 return I != state.getGlobalAddressMap(locked).end() ? I->second : 0;
147 /// getGlobalValueAtAddress - Return the LLVM global value object that starts
148 /// at the specified address.
150 const GlobalValue *ExecutionEngine::getGlobalValueAtAddress(void *Addr) {
151 MutexGuard locked(lock);
153 // If we haven't computed the reverse mapping yet, do so first.
154 if (state.getGlobalAddressReverseMap(locked).empty()) {
155 for (std::map<const GlobalValue*, void *>::iterator
156 I = state.getGlobalAddressMap(locked).begin(),
157 E = state.getGlobalAddressMap(locked).end(); I != E; ++I)
158 state.getGlobalAddressReverseMap(locked).insert(std::make_pair(I->second,
162 std::map<void *, const GlobalValue*>::iterator I =
163 state.getGlobalAddressReverseMap(locked).find(Addr);
164 return I != state.getGlobalAddressReverseMap(locked).end() ? I->second : 0;
167 // CreateArgv - Turn a vector of strings into a nice argv style array of
168 // pointers to null terminated strings.
170 static void *CreateArgv(ExecutionEngine *EE,
171 const std::vector<std::string> &InputArgv) {
172 unsigned PtrSize = EE->getTargetData()->getPointerSize();
173 char *Result = new char[(InputArgv.size()+1)*PtrSize];
175 DOUT << "ARGV = " << (void*)Result << "\n";
176 const Type *SBytePtr = PointerType::getUnqual(Type::Int8Ty);
178 for (unsigned i = 0; i != InputArgv.size(); ++i) {
179 unsigned Size = InputArgv[i].size()+1;
180 char *Dest = new char[Size];
181 DOUT << "ARGV[" << i << "] = " << (void*)Dest << "\n";
183 std::copy(InputArgv[i].begin(), InputArgv[i].end(), Dest);
186 // Endian safe: Result[i] = (PointerTy)Dest;
187 EE->StoreValueToMemory(PTOGV(Dest), (GenericValue*)(Result+i*PtrSize),
192 EE->StoreValueToMemory(PTOGV(0),
193 (GenericValue*)(Result+InputArgv.size()*PtrSize),
199 /// runStaticConstructorsDestructors - This method is used to execute all of
200 /// the static constructors or destructors for a program, depending on the
201 /// value of isDtors.
202 void ExecutionEngine::runStaticConstructorsDestructors(bool isDtors) {
203 const char *Name = isDtors ? "llvm.global_dtors" : "llvm.global_ctors";
205 // Execute global ctors/dtors for each module in the program.
206 for (unsigned m = 0, e = Modules.size(); m != e; ++m) {
207 GlobalVariable *GV = Modules[m]->getModule()->getNamedGlobal(Name);
209 // If this global has internal linkage, or if it has a use, then it must be
210 // an old-style (llvmgcc3) static ctor with __main linked in and in use. If
211 // this is the case, don't execute any of the global ctors, __main will do
213 if (!GV || GV->isDeclaration() || GV->hasInternalLinkage()) continue;
215 // Should be an array of '{ int, void ()* }' structs. The first value is
216 // the init priority, which we ignore.
217 ConstantArray *InitList = dyn_cast<ConstantArray>(GV->getInitializer());
218 if (!InitList) continue;
219 for (unsigned i = 0, e = InitList->getNumOperands(); i != e; ++i)
220 if (ConstantStruct *CS =
221 dyn_cast<ConstantStruct>(InitList->getOperand(i))) {
222 if (CS->getNumOperands() != 2) break; // Not array of 2-element structs.
224 Constant *FP = CS->getOperand(1);
225 if (FP->isNullValue())
226 break; // Found a null terminator, exit.
228 if (ConstantExpr *CE = dyn_cast<ConstantExpr>(FP))
230 FP = CE->getOperand(0);
231 if (Function *F = dyn_cast<Function>(FP)) {
232 // Execute the ctor/dtor function!
233 runFunction(F, std::vector<GenericValue>());
239 /// isTargetNullPtr - Return whether the target pointer stored at Loc is null.
240 static bool isTargetNullPtr(ExecutionEngine *EE, void *Loc) {
241 unsigned PtrSize = EE->getTargetData()->getPointerSize();
242 for (unsigned i = 0; i < PtrSize; ++i)
243 if (*(i + (uint8_t*)Loc))
248 /// runFunctionAsMain - This is a helper function which wraps runFunction to
249 /// handle the common task of starting up main with the specified argc, argv,
250 /// and envp parameters.
251 int ExecutionEngine::runFunctionAsMain(Function *Fn,
252 const std::vector<std::string> &argv,
253 const char * const * envp) {
254 std::vector<GenericValue> GVArgs;
256 GVArgc.IntVal = APInt(32, argv.size());
259 unsigned NumArgs = Fn->getFunctionType()->getNumParams();
260 const FunctionType *FTy = Fn->getFunctionType();
261 const Type* PPInt8Ty =
262 PointerType::getUnqual(PointerType::getUnqual(Type::Int8Ty));
265 if (FTy->getParamType(2) != PPInt8Ty) {
266 cerr << "Invalid type for third argument of main() supplied\n";
271 if (FTy->getParamType(1) != PPInt8Ty) {
272 cerr << "Invalid type for second argument of main() supplied\n";
277 if (FTy->getParamType(0) != Type::Int32Ty) {
278 cerr << "Invalid type for first argument of main() supplied\n";
283 if (FTy->getReturnType() != Type::Int32Ty &&
284 FTy->getReturnType() != Type::VoidTy) {
285 cerr << "Invalid return type of main() supplied\n";
290 cerr << "Invalid number of arguments of main() supplied\n";
295 GVArgs.push_back(GVArgc); // Arg #0 = argc.
297 GVArgs.push_back(PTOGV(CreateArgv(this, argv))); // Arg #1 = argv.
298 assert(!isTargetNullPtr(this, GVTOP(GVArgs[1])) &&
299 "argv[0] was null after CreateArgv");
301 std::vector<std::string> EnvVars;
302 for (unsigned i = 0; envp[i]; ++i)
303 EnvVars.push_back(envp[i]);
304 GVArgs.push_back(PTOGV(CreateArgv(this, EnvVars))); // Arg #2 = envp.
308 return runFunction(Fn, GVArgs).IntVal.getZExtValue();
311 /// If possible, create a JIT, unless the caller specifically requests an
312 /// Interpreter or there's an error. If even an Interpreter cannot be created,
313 /// NULL is returned.
315 ExecutionEngine *ExecutionEngine::create(ModuleProvider *MP,
316 bool ForceInterpreter,
317 std::string *ErrorStr) {
318 ExecutionEngine *EE = 0;
320 // Make sure we can resolve symbols in the program as well. The zero arg
321 // to the function tells DynamicLibrary to load the program, not a library.
322 if (sys::DynamicLibrary::LoadLibraryPermanently(0, ErrorStr))
325 // Unless the interpreter was explicitly selected, try making a JIT.
326 if (!ForceInterpreter && JITCtor)
327 EE = JITCtor(MP, ErrorStr);
329 // If we can't make a JIT, make an interpreter instead.
330 if (EE == 0 && InterpCtor)
331 EE = InterpCtor(MP, ErrorStr);
336 ExecutionEngine *ExecutionEngine::create(Module *M) {
337 return create(new ExistingModuleProvider(M));
340 /// getPointerToGlobal - This returns the address of the specified global
341 /// value. This may involve code generation if it's a function.
343 void *ExecutionEngine::getPointerToGlobal(const GlobalValue *GV) {
344 if (Function *F = const_cast<Function*>(dyn_cast<Function>(GV)))
345 return getPointerToFunction(F);
347 MutexGuard locked(lock);
348 void *p = state.getGlobalAddressMap(locked)[GV];
352 // Global variable might have been added since interpreter started.
353 if (GlobalVariable *GVar =
354 const_cast<GlobalVariable *>(dyn_cast<GlobalVariable>(GV)))
355 EmitGlobalVariable(GVar);
357 assert(0 && "Global hasn't had an address allocated yet!");
358 return state.getGlobalAddressMap(locked)[GV];
361 /// This function converts a Constant* into a GenericValue. The interesting
362 /// part is if C is a ConstantExpr.
363 /// @brief Get a GenericValue for a Constant*
364 GenericValue ExecutionEngine::getConstantValue(const Constant *C) {
365 // If its undefined, return the garbage.
366 if (isa<UndefValue>(C))
367 return GenericValue();
369 // If the value is a ConstantExpr
370 if (const ConstantExpr *CE = dyn_cast<ConstantExpr>(C)) {
371 Constant *Op0 = CE->getOperand(0);
372 switch (CE->getOpcode()) {
373 case Instruction::GetElementPtr: {
375 GenericValue Result = getConstantValue(Op0);
376 SmallVector<Value*, 8> Indices(CE->op_begin()+1, CE->op_end());
378 TD->getIndexedOffset(Op0->getType(), &Indices[0], Indices.size());
380 char* tmp = (char*) Result.PointerVal;
381 Result = PTOGV(tmp + Offset);
384 case Instruction::Trunc: {
385 GenericValue GV = getConstantValue(Op0);
386 uint32_t BitWidth = cast<IntegerType>(CE->getType())->getBitWidth();
387 GV.IntVal = GV.IntVal.trunc(BitWidth);
390 case Instruction::ZExt: {
391 GenericValue GV = getConstantValue(Op0);
392 uint32_t BitWidth = cast<IntegerType>(CE->getType())->getBitWidth();
393 GV.IntVal = GV.IntVal.zext(BitWidth);
396 case Instruction::SExt: {
397 GenericValue GV = getConstantValue(Op0);
398 uint32_t BitWidth = cast<IntegerType>(CE->getType())->getBitWidth();
399 GV.IntVal = GV.IntVal.sext(BitWidth);
402 case Instruction::FPTrunc: {
404 GenericValue GV = getConstantValue(Op0);
405 GV.FloatVal = float(GV.DoubleVal);
408 case Instruction::FPExt:{
410 GenericValue GV = getConstantValue(Op0);
411 GV.DoubleVal = double(GV.FloatVal);
414 case Instruction::UIToFP: {
415 GenericValue GV = getConstantValue(Op0);
416 if (CE->getType() == Type::FloatTy)
417 GV.FloatVal = float(GV.IntVal.roundToDouble());
418 else if (CE->getType() == Type::DoubleTy)
419 GV.DoubleVal = GV.IntVal.roundToDouble();
420 else if (CE->getType() == Type::X86_FP80Ty) {
421 const uint64_t zero[] = {0, 0};
422 APFloat apf = APFloat(APInt(80, 2, zero));
423 (void)apf.convertFromAPInt(GV.IntVal,
425 APFloat::rmNearestTiesToEven);
426 GV.IntVal = apf.convertToAPInt();
430 case Instruction::SIToFP: {
431 GenericValue GV = getConstantValue(Op0);
432 if (CE->getType() == Type::FloatTy)
433 GV.FloatVal = float(GV.IntVal.signedRoundToDouble());
434 else if (CE->getType() == Type::DoubleTy)
435 GV.DoubleVal = GV.IntVal.signedRoundToDouble();
436 else if (CE->getType() == Type::X86_FP80Ty) {
437 const uint64_t zero[] = { 0, 0};
438 APFloat apf = APFloat(APInt(80, 2, zero));
439 (void)apf.convertFromAPInt(GV.IntVal,
441 APFloat::rmNearestTiesToEven);
442 GV.IntVal = apf.convertToAPInt();
446 case Instruction::FPToUI: // double->APInt conversion handles sign
447 case Instruction::FPToSI: {
448 GenericValue GV = getConstantValue(Op0);
449 uint32_t BitWidth = cast<IntegerType>(CE->getType())->getBitWidth();
450 if (Op0->getType() == Type::FloatTy)
451 GV.IntVal = APIntOps::RoundFloatToAPInt(GV.FloatVal, BitWidth);
452 else if (Op0->getType() == Type::DoubleTy)
453 GV.IntVal = APIntOps::RoundDoubleToAPInt(GV.DoubleVal, BitWidth);
454 else if (Op0->getType() == Type::X86_FP80Ty) {
455 APFloat apf = APFloat(GV.IntVal);
457 (void)apf.convertToInteger(&v, BitWidth,
458 CE->getOpcode()==Instruction::FPToSI,
459 APFloat::rmTowardZero);
460 GV.IntVal = v; // endian?
464 case Instruction::PtrToInt: {
465 GenericValue GV = getConstantValue(Op0);
466 uint32_t PtrWidth = TD->getPointerSizeInBits();
467 GV.IntVal = APInt(PtrWidth, uintptr_t(GV.PointerVal));
470 case Instruction::IntToPtr: {
471 GenericValue GV = getConstantValue(Op0);
472 uint32_t PtrWidth = TD->getPointerSizeInBits();
473 if (PtrWidth != GV.IntVal.getBitWidth())
474 GV.IntVal = GV.IntVal.zextOrTrunc(PtrWidth);
475 assert(GV.IntVal.getBitWidth() <= 64 && "Bad pointer width");
476 GV.PointerVal = PointerTy(uintptr_t(GV.IntVal.getZExtValue()));
479 case Instruction::BitCast: {
480 GenericValue GV = getConstantValue(Op0);
481 const Type* DestTy = CE->getType();
482 switch (Op0->getType()->getTypeID()) {
483 default: assert(0 && "Invalid bitcast operand");
484 case Type::IntegerTyID:
485 assert(DestTy->isFloatingPoint() && "invalid bitcast");
486 if (DestTy == Type::FloatTy)
487 GV.FloatVal = GV.IntVal.bitsToFloat();
488 else if (DestTy == Type::DoubleTy)
489 GV.DoubleVal = GV.IntVal.bitsToDouble();
491 case Type::FloatTyID:
492 assert(DestTy == Type::Int32Ty && "Invalid bitcast");
493 GV.IntVal.floatToBits(GV.FloatVal);
495 case Type::DoubleTyID:
496 assert(DestTy == Type::Int64Ty && "Invalid bitcast");
497 GV.IntVal.doubleToBits(GV.DoubleVal);
499 case Type::PointerTyID:
500 assert(isa<PointerType>(DestTy) && "Invalid bitcast");
501 break; // getConstantValue(Op0) above already converted it
505 case Instruction::Add:
506 case Instruction::Sub:
507 case Instruction::Mul:
508 case Instruction::UDiv:
509 case Instruction::SDiv:
510 case Instruction::URem:
511 case Instruction::SRem:
512 case Instruction::And:
513 case Instruction::Or:
514 case Instruction::Xor: {
515 GenericValue LHS = getConstantValue(Op0);
516 GenericValue RHS = getConstantValue(CE->getOperand(1));
518 switch (CE->getOperand(0)->getType()->getTypeID()) {
519 default: assert(0 && "Bad add type!"); abort();
520 case Type::IntegerTyID:
521 switch (CE->getOpcode()) {
522 default: assert(0 && "Invalid integer opcode");
523 case Instruction::Add: GV.IntVal = LHS.IntVal + RHS.IntVal; break;
524 case Instruction::Sub: GV.IntVal = LHS.IntVal - RHS.IntVal; break;
525 case Instruction::Mul: GV.IntVal = LHS.IntVal * RHS.IntVal; break;
526 case Instruction::UDiv:GV.IntVal = LHS.IntVal.udiv(RHS.IntVal); break;
527 case Instruction::SDiv:GV.IntVal = LHS.IntVal.sdiv(RHS.IntVal); break;
528 case Instruction::URem:GV.IntVal = LHS.IntVal.urem(RHS.IntVal); break;
529 case Instruction::SRem:GV.IntVal = LHS.IntVal.srem(RHS.IntVal); break;
530 case Instruction::And: GV.IntVal = LHS.IntVal & RHS.IntVal; break;
531 case Instruction::Or: GV.IntVal = LHS.IntVal | RHS.IntVal; break;
532 case Instruction::Xor: GV.IntVal = LHS.IntVal ^ RHS.IntVal; break;
535 case Type::FloatTyID:
536 switch (CE->getOpcode()) {
537 default: assert(0 && "Invalid float opcode"); abort();
538 case Instruction::Add:
539 GV.FloatVal = LHS.FloatVal + RHS.FloatVal; break;
540 case Instruction::Sub:
541 GV.FloatVal = LHS.FloatVal - RHS.FloatVal; break;
542 case Instruction::Mul:
543 GV.FloatVal = LHS.FloatVal * RHS.FloatVal; break;
544 case Instruction::FDiv:
545 GV.FloatVal = LHS.FloatVal / RHS.FloatVal; break;
546 case Instruction::FRem:
547 GV.FloatVal = ::fmodf(LHS.FloatVal,RHS.FloatVal); break;
550 case Type::DoubleTyID:
551 switch (CE->getOpcode()) {
552 default: assert(0 && "Invalid double opcode"); abort();
553 case Instruction::Add:
554 GV.DoubleVal = LHS.DoubleVal + RHS.DoubleVal; break;
555 case Instruction::Sub:
556 GV.DoubleVal = LHS.DoubleVal - RHS.DoubleVal; break;
557 case Instruction::Mul:
558 GV.DoubleVal = LHS.DoubleVal * RHS.DoubleVal; break;
559 case Instruction::FDiv:
560 GV.DoubleVal = LHS.DoubleVal / RHS.DoubleVal; break;
561 case Instruction::FRem:
562 GV.DoubleVal = ::fmod(LHS.DoubleVal,RHS.DoubleVal); break;
565 case Type::X86_FP80TyID:
566 case Type::PPC_FP128TyID:
567 case Type::FP128TyID: {
568 APFloat apfLHS = APFloat(LHS.IntVal);
569 switch (CE->getOpcode()) {
570 default: assert(0 && "Invalid long double opcode"); abort();
571 case Instruction::Add:
572 apfLHS.add(APFloat(RHS.IntVal), APFloat::rmNearestTiesToEven);
573 GV.IntVal = apfLHS.convertToAPInt();
575 case Instruction::Sub:
576 apfLHS.subtract(APFloat(RHS.IntVal), APFloat::rmNearestTiesToEven);
577 GV.IntVal = apfLHS.convertToAPInt();
579 case Instruction::Mul:
580 apfLHS.multiply(APFloat(RHS.IntVal), APFloat::rmNearestTiesToEven);
581 GV.IntVal = apfLHS.convertToAPInt();
583 case Instruction::FDiv:
584 apfLHS.divide(APFloat(RHS.IntVal), APFloat::rmNearestTiesToEven);
585 GV.IntVal = apfLHS.convertToAPInt();
587 case Instruction::FRem:
588 apfLHS.mod(APFloat(RHS.IntVal), APFloat::rmNearestTiesToEven);
589 GV.IntVal = apfLHS.convertToAPInt();
600 cerr << "ConstantExpr not handled: " << *CE << "\n";
605 switch (C->getType()->getTypeID()) {
606 case Type::FloatTyID:
607 Result.FloatVal = cast<ConstantFP>(C)->getValueAPF().convertToFloat();
609 case Type::DoubleTyID:
610 Result.DoubleVal = cast<ConstantFP>(C)->getValueAPF().convertToDouble();
612 case Type::X86_FP80TyID:
613 case Type::FP128TyID:
614 case Type::PPC_FP128TyID:
615 Result.IntVal = cast <ConstantFP>(C)->getValueAPF().convertToAPInt();
617 case Type::IntegerTyID:
618 Result.IntVal = cast<ConstantInt>(C)->getValue();
620 case Type::PointerTyID:
621 if (isa<ConstantPointerNull>(C))
622 Result.PointerVal = 0;
623 else if (const Function *F = dyn_cast<Function>(C))
624 Result = PTOGV(getPointerToFunctionOrStub(const_cast<Function*>(F)));
625 else if (const GlobalVariable* GV = dyn_cast<GlobalVariable>(C))
626 Result = PTOGV(getOrEmitGlobalVariable(const_cast<GlobalVariable*>(GV)));
628 assert(0 && "Unknown constant pointer type!");
631 cerr << "ERROR: Constant unimplemented for type: " << *C->getType() << "\n";
637 /// StoreIntToMemory - Fills the StoreBytes bytes of memory starting from Dst
638 /// with the integer held in IntVal.
639 static void StoreIntToMemory(const APInt &IntVal, uint8_t *Dst,
640 unsigned StoreBytes) {
641 assert((IntVal.getBitWidth()+7)/8 >= StoreBytes && "Integer too small!");
642 uint8_t *Src = (uint8_t *)IntVal.getRawData();
644 if (sys::littleEndianHost())
645 // Little-endian host - the source is ordered from LSB to MSB. Order the
646 // destination from LSB to MSB: Do a straight copy.
647 memcpy(Dst, Src, StoreBytes);
649 // Big-endian host - the source is an array of 64 bit words ordered from
650 // LSW to MSW. Each word is ordered from MSB to LSB. Order the destination
651 // from MSB to LSB: Reverse the word order, but not the bytes in a word.
652 while (StoreBytes > sizeof(uint64_t)) {
653 StoreBytes -= sizeof(uint64_t);
654 // May not be aligned so use memcpy.
655 memcpy(Dst + StoreBytes, Src, sizeof(uint64_t));
656 Src += sizeof(uint64_t);
659 memcpy(Dst, Src + sizeof(uint64_t) - StoreBytes, StoreBytes);
663 /// StoreValueToMemory - Stores the data in Val of type Ty at address Ptr. Ptr
664 /// is the address of the memory at which to store Val, cast to GenericValue *.
665 /// It is not a pointer to a GenericValue containing the address at which to
667 void ExecutionEngine::StoreValueToMemory(const GenericValue &Val, GenericValue *Ptr,
669 const unsigned StoreBytes = getTargetData()->getTypeStoreSize(Ty);
671 switch (Ty->getTypeID()) {
672 case Type::IntegerTyID:
673 StoreIntToMemory(Val.IntVal, (uint8_t*)Ptr, StoreBytes);
675 case Type::FloatTyID:
676 *((float*)Ptr) = Val.FloatVal;
678 case Type::DoubleTyID:
679 *((double*)Ptr) = Val.DoubleVal;
681 case Type::X86_FP80TyID: {
682 uint16_t *Dest = (uint16_t*)Ptr;
683 const uint16_t *Src = (uint16_t*)Val.IntVal.getRawData();
684 // This is endian dependent, but it will only work on x86 anyway.
692 case Type::PointerTyID:
693 // Ensure 64 bit target pointers are fully initialized on 32 bit hosts.
694 if (StoreBytes != sizeof(PointerTy))
695 memset(Ptr, 0, StoreBytes);
697 *((PointerTy*)Ptr) = Val.PointerVal;
700 cerr << "Cannot store value of type " << *Ty << "!\n";
703 if (sys::littleEndianHost() != getTargetData()->isLittleEndian())
704 // Host and target are different endian - reverse the stored bytes.
705 std::reverse((uint8_t*)Ptr, StoreBytes + (uint8_t*)Ptr);
708 /// LoadIntFromMemory - Loads the integer stored in the LoadBytes bytes starting
709 /// from Src into IntVal, which is assumed to be wide enough and to hold zero.
710 static void LoadIntFromMemory(APInt &IntVal, uint8_t *Src, unsigned LoadBytes) {
711 assert((IntVal.getBitWidth()+7)/8 >= LoadBytes && "Integer too small!");
712 uint8_t *Dst = (uint8_t *)IntVal.getRawData();
714 if (sys::littleEndianHost())
715 // Little-endian host - the destination must be ordered from LSB to MSB.
716 // The source is ordered from LSB to MSB: Do a straight copy.
717 memcpy(Dst, Src, LoadBytes);
719 // Big-endian - the destination is an array of 64 bit words ordered from
720 // LSW to MSW. Each word must be ordered from MSB to LSB. The source is
721 // ordered from MSB to LSB: Reverse the word order, but not the bytes in
723 while (LoadBytes > sizeof(uint64_t)) {
724 LoadBytes -= sizeof(uint64_t);
725 // May not be aligned so use memcpy.
726 memcpy(Dst, Src + LoadBytes, sizeof(uint64_t));
727 Dst += sizeof(uint64_t);
730 memcpy(Dst + sizeof(uint64_t) - LoadBytes, Src, LoadBytes);
736 void ExecutionEngine::LoadValueFromMemory(GenericValue &Result,
739 const unsigned LoadBytes = getTargetData()->getTypeStoreSize(Ty);
741 if (sys::littleEndianHost() != getTargetData()->isLittleEndian()) {
742 // Host and target are different endian - reverse copy the stored
743 // bytes into a buffer, and load from that.
744 uint8_t *Src = (uint8_t*)Ptr;
745 uint8_t *Buf = (uint8_t*)alloca(LoadBytes);
746 std::reverse_copy(Src, Src + LoadBytes, Buf);
747 Ptr = (GenericValue*)Buf;
750 switch (Ty->getTypeID()) {
751 case Type::IntegerTyID:
752 // An APInt with all words initially zero.
753 Result.IntVal = APInt(cast<IntegerType>(Ty)->getBitWidth(), 0);
754 LoadIntFromMemory(Result.IntVal, (uint8_t*)Ptr, LoadBytes);
756 case Type::FloatTyID:
757 Result.FloatVal = *((float*)Ptr);
759 case Type::DoubleTyID:
760 Result.DoubleVal = *((double*)Ptr);
762 case Type::PointerTyID:
763 Result.PointerVal = *((PointerTy*)Ptr);
765 case Type::X86_FP80TyID: {
766 // This is endian dependent, but it will only work on x86 anyway.
767 // FIXME: Will not trap if loading a signaling NaN.
768 uint16_t *p = (uint16_t*)Ptr;
778 Result.IntVal = APInt(80, 2, y);
782 cerr << "Cannot load value of type " << *Ty << "!\n";
787 // InitializeMemory - Recursive function to apply a Constant value into the
788 // specified memory location...
790 void ExecutionEngine::InitializeMemory(const Constant *Init, void *Addr) {
791 if (isa<UndefValue>(Init)) {
793 } else if (const ConstantVector *CP = dyn_cast<ConstantVector>(Init)) {
794 unsigned ElementSize =
795 getTargetData()->getABITypeSize(CP->getType()->getElementType());
796 for (unsigned i = 0, e = CP->getNumOperands(); i != e; ++i)
797 InitializeMemory(CP->getOperand(i), (char*)Addr+i*ElementSize);
799 } else if (isa<ConstantAggregateZero>(Init)) {
800 memset(Addr, 0, (size_t)getTargetData()->getABITypeSize(Init->getType()));
802 } else if (Init->getType()->isFirstClassType()) {
803 GenericValue Val = getConstantValue(Init);
804 StoreValueToMemory(Val, (GenericValue*)Addr, Init->getType());
808 switch (Init->getType()->getTypeID()) {
809 case Type::ArrayTyID: {
810 const ConstantArray *CPA = cast<ConstantArray>(Init);
811 unsigned ElementSize =
812 getTargetData()->getABITypeSize(CPA->getType()->getElementType());
813 for (unsigned i = 0, e = CPA->getNumOperands(); i != e; ++i)
814 InitializeMemory(CPA->getOperand(i), (char*)Addr+i*ElementSize);
818 case Type::StructTyID: {
819 const ConstantStruct *CPS = cast<ConstantStruct>(Init);
820 const StructLayout *SL =
821 getTargetData()->getStructLayout(cast<StructType>(CPS->getType()));
822 for (unsigned i = 0, e = CPS->getNumOperands(); i != e; ++i)
823 InitializeMemory(CPS->getOperand(i), (char*)Addr+SL->getElementOffset(i));
828 cerr << "Bad Type: " << *Init->getType() << "\n";
829 assert(0 && "Unknown constant type to initialize memory with!");
833 /// EmitGlobals - Emit all of the global variables to memory, storing their
834 /// addresses into GlobalAddress. This must make sure to copy the contents of
835 /// their initializers into the memory.
837 void ExecutionEngine::emitGlobals() {
838 const TargetData *TD = getTargetData();
840 // Loop over all of the global variables in the program, allocating the memory
841 // to hold them. If there is more than one module, do a prepass over globals
842 // to figure out how the different modules should link together.
844 std::map<std::pair<std::string, const Type*>,
845 const GlobalValue*> LinkedGlobalsMap;
847 if (Modules.size() != 1) {
848 for (unsigned m = 0, e = Modules.size(); m != e; ++m) {
849 Module &M = *Modules[m]->getModule();
850 for (Module::const_global_iterator I = M.global_begin(),
851 E = M.global_end(); I != E; ++I) {
852 const GlobalValue *GV = I;
853 if (GV->hasInternalLinkage() || GV->isDeclaration() ||
854 GV->hasAppendingLinkage() || !GV->hasName())
855 continue;// Ignore external globals and globals with internal linkage.
857 const GlobalValue *&GVEntry =
858 LinkedGlobalsMap[std::make_pair(GV->getName(), GV->getType())];
860 // If this is the first time we've seen this global, it is the canonical
867 // If the existing global is strong, never replace it.
868 if (GVEntry->hasExternalLinkage() ||
869 GVEntry->hasDLLImportLinkage() ||
870 GVEntry->hasDLLExportLinkage())
873 // Otherwise, we know it's linkonce/weak, replace it if this is a strong
875 if (GV->hasExternalLinkage() || GVEntry->hasExternalWeakLinkage())
881 std::vector<const GlobalValue*> NonCanonicalGlobals;
882 for (unsigned m = 0, e = Modules.size(); m != e; ++m) {
883 Module &M = *Modules[m]->getModule();
884 for (Module::const_global_iterator I = M.global_begin(), E = M.global_end();
886 // In the multi-module case, see what this global maps to.
887 if (!LinkedGlobalsMap.empty()) {
888 if (const GlobalValue *GVEntry =
889 LinkedGlobalsMap[std::make_pair(I->getName(), I->getType())]) {
890 // If something else is the canonical global, ignore this one.
891 if (GVEntry != &*I) {
892 NonCanonicalGlobals.push_back(I);
898 if (!I->isDeclaration()) {
899 // Get the type of the global.
900 const Type *Ty = I->getType()->getElementType();
902 // Allocate some memory for it!
903 unsigned Size = TD->getABITypeSize(Ty);
904 addGlobalMapping(I, new char[Size]);
906 // External variable reference. Try to use the dynamic loader to
907 // get a pointer to it.
909 sys::DynamicLibrary::SearchForAddressOfSymbol(I->getName().c_str()))
910 addGlobalMapping(I, SymAddr);
912 cerr << "Could not resolve external global address: "
913 << I->getName() << "\n";
919 // If there are multiple modules, map the non-canonical globals to their
920 // canonical location.
921 if (!NonCanonicalGlobals.empty()) {
922 for (unsigned i = 0, e = NonCanonicalGlobals.size(); i != e; ++i) {
923 const GlobalValue *GV = NonCanonicalGlobals[i];
924 const GlobalValue *CGV =
925 LinkedGlobalsMap[std::make_pair(GV->getName(), GV->getType())];
926 void *Ptr = getPointerToGlobalIfAvailable(CGV);
927 assert(Ptr && "Canonical global wasn't codegen'd!");
928 addGlobalMapping(GV, getPointerToGlobalIfAvailable(CGV));
932 // Now that all of the globals are set up in memory, loop through them all
933 // and initialize their contents.
934 for (Module::const_global_iterator I = M.global_begin(), E = M.global_end();
936 if (!I->isDeclaration()) {
937 if (!LinkedGlobalsMap.empty()) {
938 if (const GlobalValue *GVEntry =
939 LinkedGlobalsMap[std::make_pair(I->getName(), I->getType())])
940 if (GVEntry != &*I) // Not the canonical variable.
943 EmitGlobalVariable(I);
949 // EmitGlobalVariable - This method emits the specified global variable to the
950 // address specified in GlobalAddresses, or allocates new memory if it's not
951 // already in the map.
952 void ExecutionEngine::EmitGlobalVariable(const GlobalVariable *GV) {
953 void *GA = getPointerToGlobalIfAvailable(GV);
954 DOUT << "Global '" << GV->getName() << "' -> " << GA << "\n";
956 const Type *ElTy = GV->getType()->getElementType();
957 size_t GVSize = (size_t)getTargetData()->getABITypeSize(ElTy);
959 // If it's not already specified, allocate memory for the global.
960 GA = new char[GVSize];
961 addGlobalMapping(GV, GA);
964 InitializeMemory(GV->getInitializer(), GA);
965 NumInitBytes += (unsigned)GVSize;